/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user.
 *
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 *
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 *
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 *
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 *
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 */

/*
 * xdr.h, External Data Representation Serialization Routines.
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 */

#ifndef _RPC_XDR_H
#define _RPC_XDR_H

#include <rpc/types.h>

/* We need FILE.  */
#include <stdio.h>

/*
 * XDR provides a conventional way for converting between C data
 * types and an external bit-string representation.  Library supplied
 * routines provide for the conversion on built-in C data types.  These
 * routines and utility routines defined here are used to help implement
 * a type encode/decode routine for each user-defined type.
 *
 * Each data type provides a single procedure which takes two arguments:
 *
 *      bool_t
 *      xdrproc(xdrs, argresp)
 *              XDR *xdrs;
 *              <type> *argresp;
 *
 * xdrs is an instance of a XDR handle, to which or from which the data
 * type is to be converted.  argresp is a pointer to the structure to be
 * converted.  The XDR handle contains an operation field which indicates
 * which of the operations (ENCODE, DECODE * or FREE) is to be performed.
 *
 * XDR_DECODE may allocate space if the pointer argresp is null.  This
 * data can be freed with the XDR_FREE operation.
 *
 * We write only one procedure per data type to make it easy
 * to keep the encode and decode procedures for a data type consistent.
 * In many cases the same code performs all operations on a user defined type,
 * because all the hard work is done in the component type routines.
 * decode as a series of calls on the nested data types.
 */

/*
 * Xdr operations.  XDR_ENCODE causes the type to be encoded into the
 * stream.  XDR_DECODE causes the type to be extracted from the stream.
 * XDR_FREE can be used to release the space allocated by an XDR_DECODE
 * request.
 */
enum xdr_op {
	XDR_ENCODE = 0,
	XDR_DECODE = 1,
	XDR_FREE = 2
};

/*
 * This is the number of bytes per unit of external data.
 */
#define BYTES_PER_XDR_UNIT	(4)
/*
 * This only works if the above is a power of 2.  But it's defined to be
 * 4 by the appropriate RFCs.  So it will work.  And it's normally quicker
 * than the old routine.
 */
#define RNDUP(x)  (((x) + BYTES_PER_XDR_UNIT - 1) & ~(BYTES_PER_XDR_UNIT - 1))

/*
 * The XDR handle.
 * Contains operation which is being applied to the stream,
 * an operations vector for the particular implementation (e.g. see xdr_mem.c),
 * and two private fields for the use of the particular implementation.
 */
typedef struct XDR XDR;
struct XDR {
	enum xdr_op x_op;		/* operation; fast additional param */
	struct xdr_ops {
		bool_t (*x_getlong)(XDR* __xdrs, long* __lp);
		/* get a long from underlying stream */
		bool_t (*x_putlong)(XDR* __xdrs, const long* __lp);
		/* put a long to " */
		bool_t (*x_getbytes)(XDR* __xdrs, char* __addr, unsigned int __len);
		/* get some bytes from " */
		bool_t (*x_putbytes)(XDR* __xdrs, const char* __addr, unsigned int __len);
		/* put some bytes to " */
		unsigned int (*x_getpostn)(const XDR* __xdrs);
		/* returns bytes off from beginning */
		bool_t (*x_setpostn)(XDR* __xdrs, unsigned int __pos);
		/* lets you reposition the stream */
		int32_t* (*x_inline)(XDR* __xdrs, unsigned int __len);
		/* buf quick ptr to buffered data */
		void (*x_destroy)(XDR* __xdrs);
		/* free privates of this xdr_stream */
		bool_t (*x_getint32)(XDR* __xdrs, int32_t* __ip);
		/* get a int from underlying stream */
		bool_t (*x_putint32)(XDR* __xdrs, const int32_t* __ip);
		/* put a int to " */
	}
	* x_ops;
	char* x_public;		/* users' data */
	char* x_private;		/* pointer to private data */
	char* x_base;		/* private used for position info */
	unsigned int x_handy;	/* extra private word */
};

/*
 * A xdrproc_t exists for each data type which is to be encoded or decoded.
 *
 * The second argument to the xdrproc_t is a pointer to an opaque pointer.
 * The opaque pointer generally points to a structure of the data type
 * to be decoded.  If this pointer is 0, then the type routines should
 * allocate dynamic storage of the appropriate size and return it.
 * bool_t       (*xdrproc_t)(XDR *, char* *);
 */
typedef bool_t (*xdrproc_t)(XDR*, void*, ...);


/*
 * Operations defined on a XDR handle
 *
 * XDR          *xdrs;
 * int32_t      *int32p;
 * long         *longp;
 * char*       addr;
 * unsigned int         len;
 * unsigned int         pos;
 */
#define XDR_GETINT32(xdrs, int32p)                      \
        (*(xdrs)->x_ops->x_getint32)(xdrs, int32p)
#define xdr_getint32(xdrs, int32p)                      \
        (*(xdrs)->x_ops->x_getint32)(xdrs, int32p)

#define XDR_PUTINT32(xdrs, int32p)                      \
        (*(xdrs)->x_ops->x_putint32)(xdrs, int32p)
#define xdr_putint32(xdrs, int32p)                      \
        (*(xdrs)->x_ops->x_putint32)(xdrs, int32p)

#define XDR_GETLONG(xdrs, longp)			\
	(*(xdrs)->x_ops->x_getlong)(xdrs, longp)
#define xdr_getlong(xdrs, longp)			\
	(*(xdrs)->x_ops->x_getlong)(xdrs, longp)

#define XDR_PUTLONG(xdrs, longp)			\
	(*(xdrs)->x_ops->x_putlong)(xdrs, longp)
#define xdr_putlong(xdrs, longp)			\
	(*(xdrs)->x_ops->x_putlong)(xdrs, longp)

#define XDR_GETBYTES(xdrs, addr, len)			\
	(*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len)
#define xdr_getbytes(xdrs, addr, len)			\
	(*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len)

#define XDR_PUTBYTES(xdrs, addr, len)			\
	(*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len)
#define xdr_putbytes(xdrs, addr, len)			\
	(*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len)

#define XDR_GETPOS(xdrs)				\
	(*(xdrs)->x_ops->x_getpostn)(xdrs)
#define xdr_getpos(xdrs)				\
	(*(xdrs)->x_ops->x_getpostn)(xdrs)

#define XDR_SETPOS(xdrs, pos)				\
	(*(xdrs)->x_ops->x_setpostn)(xdrs, pos)
#define xdr_setpos(xdrs, pos)				\
	(*(xdrs)->x_ops->x_setpostn)(xdrs, pos)

#define	XDR_INLINE(xdrs, len)				\
	(*(xdrs)->x_ops->x_inline)(xdrs, len)
#define	xdr_inline(xdrs, len)				\
	(*(xdrs)->x_ops->x_inline)(xdrs, len)

#define	XDR_DESTROY(xdrs)					\
	do {							\
		if ((xdrs)->x_ops->x_destroy)			\
			(*(xdrs)->x_ops->x_destroy)(xdrs);	\
	} while (0)
#define	xdr_destroy(xdrs)					\
	do {							\
		if ((xdrs)->x_ops->x_destroy)			\
			(*(xdrs)->x_ops->x_destroy)(xdrs);	\
	} while (0)

/*
 * Support struct for discriminated unions.
 * You create an array of xdrdiscrim structures, terminated with
 * a entry with a null procedure pointer.  The xdr_union routine gets
 * the discriminant value and then searches the array of structures
 * for a matching value.  If a match is found the associated xdr routine
 * is called to handle that part of the union.  If there is
 * no match, then a default routine may be called.
 * If there is no match and no default routine it is an error.
 */
#define NULL_xdrproc_t ((xdrproc_t)0)
struct xdr_discrim {
	int value;
	xdrproc_t proc;
};

/*
 * Inline routines for fast encode/decode of primitive data types.
 * Caveat emptor: these use single memory cycles to get the
 * data from the underlying buffer, and will fail to operate
 * properly if the data is not aligned.  The standard way to use these
 * is to say:
 *      if ((buf = XDR_INLINE(xdrs, count)) == NULL)
 *              return (FALSE);
 *      <<< macro calls >>>
 * where ``count'' is the number of bytes of data occupied
 * by the primitive data types.
 *
 * N.B. and frozen for all time: each data type here uses 4 bytes
 * of external representation.
 */

#define IXDR_GET_INT32(buf)           ((int32_t)ntohl((uint32_t)*(buf)++))
#define IXDR_PUT_INT32(buf, v)        (*(buf)++ = (int32_t)htonl((uint32_t)(v)))
#define IXDR_GET_U_INT32(buf)         ((uint32_t)IXDR_GET_INT32(buf))
#define IXDR_PUT_U_INT32(buf, v)      IXDR_PUT_INT32(buf, (int32_t)(v))

/* WARNING: The IXDR_*_LONG defines are removed by Sun for new platforms
 * and shouldn't be used any longer. Code which use this defines or longs
 * in the RPC code will not work on 64bit Solaris platforms !
 */
#define IXDR_GET_LONG(buf)	      ((long)IXDR_GET_U_INT32(buf))
#define IXDR_PUT_LONG(buf, v)	      ((long)IXDR_PUT_INT32(buf, (long)(v)))
#define IXDR_GET_U_LONG(buf)	      ((unsigned long)IXDR_GET_LONG(buf))
#define IXDR_PUT_U_LONG(buf, v)	      IXDR_PUT_LONG(buf, (long)(v))


#define IXDR_GET_BOOL(buf)            ((bool_t)IXDR_GET_LONG(buf))
#define IXDR_GET_ENUM(buf, t)         ((t)IXDR_GET_LONG(buf))
#define IXDR_GET_SHORT(buf)           ((short)IXDR_GET_LONG(buf))
#define IXDR_GET_U_SHORT(buf)         ((unsigned short)IXDR_GET_LONG(buf))

#define IXDR_PUT_BOOL(buf, v)         IXDR_PUT_LONG(buf, (long)(v))
#define IXDR_PUT_ENUM(buf, v)         IXDR_PUT_LONG(buf, (long)(v))
#define IXDR_PUT_SHORT(buf, v)        IXDR_PUT_LONG(buf, (long)(v))
#define IXDR_PUT_U_SHORT(buf, v)      IXDR_PUT_LONG(buf, (long)(v))

/*
 * These are the "generic" xdr routines.
 * None of these can have const applied because it's not possible to
 * know whether the call is a read or a write to the passed parameter
 * also, the XDR structure is always updated by some of these calls.
 */
extern bool_t xdr_void(void);
extern bool_t xdr_short(XDR* __xdrs, short* __sp);
extern bool_t xdr_u_short(XDR* __xdrs, unsigned short* __usp);
extern bool_t xdr_int(XDR* __xdrs, int* __ip);
extern bool_t xdr_u_int(XDR* __xdrs, unsigned int* __up);
extern bool_t xdr_long(XDR* __xdrs, long* __lp);
extern bool_t xdr_u_long(XDR* __xdrs, unsigned long* __ulp);
extern bool_t xdr_hyper(XDR* __xdrs, int64_t* __llp);
extern bool_t xdr_u_hyper(XDR* __xdrs, uint64_t* __ullp);
extern bool_t xdr_longlong_t (XDR* __xdrs, int64_t* __llp);
extern bool_t xdr_u_longlong_t (XDR* __xdrs, uint64_t* __ullp);
extern bool_t xdr_int8_t (XDR* __xdrs, int8_t* __ip);
extern bool_t xdr_uint8_t (XDR* __xdrs, uint8_t* __up);
extern bool_t xdr_int16_t (XDR* __xdrs, int16_t* __ip);
extern bool_t xdr_uint16_t (XDR* __xdrs, uint16_t* __up);
extern bool_t xdr_int32_t (XDR* __xdrs, int32_t* __ip);
extern bool_t xdr_uint32_t (XDR* __xdrs, uint32_t* __up);
extern bool_t xdr_int64_t (XDR* __xdrs, int64_t* __ip);
extern bool_t xdr_uint64_t (XDR* __xdrs, uint64_t* __up);
extern bool_t xdr_bool(XDR* __xdrs, bool_t* __bp);
extern bool_t xdr_enum(XDR* __xdrs, enum_t* __ep);
extern bool_t xdr_array(XDR* _xdrs, char * *__addrp, unsigned int* __sizep,
                        unsigned int __maxsize, unsigned int __elsize, xdrproc_t __elproc);
extern bool_t xdr_bytes(XDR* xdrs, char** cpp, unsigned int* sizep,
                        unsigned int maxsize);
extern bool_t xdr_opaque(XDR* __xdrs, char* __cp, unsigned int __cnt);
extern bool_t xdr_string(XDR* xdrs, char** cpp, unsigned int maxsize);
extern bool_t xdr_union(XDR* __xdrs, enum_t* __dscmp, char* __unp,
                        const struct xdr_discrim* __choices,
                        xdrproc_t dfault);
extern bool_t xdr_char(XDR* __xdrs, char* __cp);
extern bool_t xdr_u_char(XDR* __xdrs, unsigned char* __cp);
extern bool_t xdr_vector(XDR* __xdrs, char* __basep, unsigned int __nelem,
                         unsigned int __elemsize, xdrproc_t __xdr_elem);
extern bool_t xdr_float(XDR* __xdrs, float* __fp);
extern bool_t xdr_double(XDR* __xdrs, double* __dp);
extern bool_t xdr_reference(XDR* __xdrs, char * *__xpp, unsigned int __size,
                            xdrproc_t __proc);
extern bool_t xdr_pointer(XDR* __xdrs, char** __objpp,
                          unsigned int __obj_size, xdrproc_t __xdr_obj);
extern bool_t xdr_wrapstring(XDR* __xdrs, char** cpp);
extern unsigned long xdr_sizeof(xdrproc_t, void*);

/*
 * Common opaque bytes objects used by many rpc protocols;
 * declared here due to commonality.
 */
#define MAX_NETOBJ_SZ 1024
struct netobj {
	unsigned int n_len;
	char* n_bytes;
};
typedef struct netobj netobj;
extern bool_t xdr_netobj(XDR* __xdrs, struct netobj* __np);

/*
 * These are the public routines for the various implementations of
 * xdr streams.
 */

/* XDR using memory buffers */
extern void xdrmem_create(XDR* __xdrs, const char* __addr,
                          unsigned int __size, enum xdr_op __xop);

/* XDR pseudo records for tcp */
extern void xdrrec_create(XDR* __xdrs, unsigned int __sendsize,
                          unsigned int __recvsize, char* __tcp_handle,
                          int (*__readit)(char*, char*, int),
                          int (*__writeit)(char*, char*, int));

/* make end of xdr record */
extern bool_t xdrrec_endofrecord(XDR* __xdrs, bool_t __sendnow);

/* move to beginning of next record */
extern bool_t xdrrec_skiprecord(XDR* __xdrs);

/* true if no more input */
extern bool_t xdrrec_eof(XDR* __xdrs);

/* free memory buffers for xdr */
extern void xdr_free(xdrproc_t __proc, char* __objp);

#endif /* rpc/xdr.h */
